Book-lock.



S. H. ALLISON;

. BOOK LOCK.

PPLIOATION FILED MAR. 27, 1906,

' Patented Jan. 19, 1909.

WMKM

r rron v5) STEPHEN H. ALLISON, OF BERKELEY, CALIFORNIA.

BOOK-LOCK.

Specification of Letters Patent.

Patented Jan. 19, 1909.

Application filed March 27, 1905. Serial No. 252,263.

To all whom it may concern:

Be it known that I, STEPHEN H. ALLISON, a citizen of the United States,and a resident of the town of Berkeley, county of Alameda, State ofCalifornia, have invented certain new and useful BooleLock-s, of which.the following is a specification.

The object of my invention is to provide an interchangeable book-lockfor locking books of various sizes.

I accomplish my object by the means illustrated in the accompanyingdrawing of which,

Figure 1 is a perspective view of my lock in operative position on abook; Fig. 2, a perspective view of my lock looking in a directionopposite to that of Fig. 1; Fig. 3 a side view in elevation; Fig. 4 afront view; Fig. 5 a vertical sectional view along the line a" Fig. 3;Fig 6 a perspective view of a modified form of tenant described below.

Similar numerals of reference refer to similar parts throughout theseveral views.

In general terms my invention consists of means for claspin'g theoutside covers of books of various sizes, and of locking the claspingmeans; and in addition thereto, of a tenant, or flexible tongue adaptedto be held between the leaves of a book locked by my device, whereby anyadditional pressure exerted upon the book in order to loosen it from theclasping means, will be received upon said tenant, and the bookprevented from being withdrawn.

Explaining my device in detail, and referring to the drawings filedherewith, 1 is the upper plate of my lock, and 2 the lower plate. Plate1 carries a pair of legs 3 and 4, having notches 5, 6, cut therein.Plate 2 carries a casing 7 provided with apertures 8 and 9 into whichlegs 3 and 4 are slidable. Casing 7 contains a pair of dogs 10, 11,pivoted therein, and said dogs are actuated Improvements in by spring 12to engage notches 5, 6. Said engagement may be released by a key inserted in keyhole 13. The tongue or tenant 14 is made of flexiblematerial attached to the casing as at 15.

A modified form of tenant is shown in Fig. 6. In this form the tenanthas, besides the part that goes between the bookleaves, legs orextensions which engage legs 3 and 4.

To operate my device tenant 14 or 16 as the case may be, is insertedbetween the leaves of a book to be locked; placing the covers of saidbook between plates 1 and 2 and exerting compressing force on saidplates. The dogs 10, and 11 thereupon engage legs 3 and 4 by theirnotches 5, 6, whereby said covers are held in a compressed state underlock. Tenant aforesaid is squeezed tightly between the leaves, and anyfurther pressure on the book to disengage it from plates 1 and 2 wouldonly hold the tenant the tighter. Moreover, if by any means other thanunlocking, my device is slipped off the book, the flexible character oftenant prevents its being replaced with the lock, and the fact that thebook has been tampered with is exposed.

I claim:

1. In an interchangeable book-lock, the combination with a pair oflock-plates of a flexible tongue attached thereto at a pointintermediate their opposing surfaces.

2. In an interchangeable book-lock, means for preventing withdrawal ofsaid lock com- 'prising a flexible tongue attached thereto,

arranged to enter between the leaves of a book to be locked.

In testimony whereof I have hereunto signed my name in the presence oftwo witnesses.

STEPHEi H. ALLISON. Witnesses:

Z. G. MEDINA, H. A. Moss.

